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Consider sending a large file of Z bits from Host A to Host B. There are...

Consider sending a large file of Z bits from Host A to Host B. There are four links (and three switches) between A and B, and the links are uncogested (that is, no queuing delays). Host A segments the file segments of S bits each and adds 60 bits header to each segment, forming packets of L = 60 + s bits. Each link has a transmitting rate of R bps. Propagation delay is p microseconds/kilometer. Consider the following distances: A to X = d1 km; X to Y = d2 km; Y to Z= d3 km; Z to B = d4km. Fild the value of S that minimizing the delay of moving the file from Host A to Host B. (Do not ignore propagation delay)

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